How does radioactivity make it possible to understand how Earth can be so old and still have a hot interior? A. Radioactive elements trap heat from underground magmd chambers.

B. Radioactive elements absorb heat from the atmosphere and release it underground.

C. Radioactive elements near the core release heat as theirnuclei decay.

D. Radioactive elements absorb the cold temperatures underground.

Radioactive elements near the core release heat as their nuclei decay. ... Radioactive elements absorb the cold temperatures underground

why do the isotopes of a particular element behave differently in nuclear reactions but the same in chemical reactions? chemical reactions involve changes to electrons in an atom; isotopes do not differ in electrons, and so they react the same way during chemical changes.